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  1. Arya

    Acceptable amount of blowby for 2021 6.7L Cummins with 53k mi?

    Just got a new-to-me 2021 2500 Cummins with 53k miles. Checked the oil filler cap and I’m seeing a bit of smoke coming out plus the cap wiggles a little bit. Is this an acceptable amount of blowby or do I have a problem? Is this just normal ventilation and the cap movement is engine vibration...
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